Yesterday, I got an email invitation to participate BOG FP+ lunch and was able to secure a time slot at around 6 pm eastern time. The day I picked (Saturday) was 26 days out. Before I found out about the 27 day window, I had tried a day that was 30 days out. No availability for that day..a Wednesday. I was asked to put in my onsite resort reservation number when I logged in to the site but based on what I'm reading here, I don't know if that was necessary.
The reservation does not show up in the regular MDE app/website.
My thinking is that if I got a reservation on a Saturday on the day after reservations were allowed that it might not be a "6 am on the day ressies open" kind of thing. My day was available for 36 hours when I booked. The time slot pickings were slim by then, however. Only 2 time slots available for a party of 2.